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Date:      Sun, 8 Nov 2015 21:03:28 +0700
From:      Eugene Grosbein <eugen@grosbein.net>
To:        Adrian Chadd <adrian@freebsd.org>
Cc:        Warner Losh <imp@bsdimp.com>, "freebsd-mips@freebsd.org" <freebsd-mips@freebsd.org>
Subject:   Re: CPU underload
Message-ID:  <563F5630.2000407@grosbein.net>
In-Reply-To: <CAJ-Vmo=0vOAq8db_GeLWmdXr7xJdzUh44ZZJrQ9vVdpvzT9hiQ@mail.gmail.com>
References:  <56348063.3090508@grosbein.net> <56348239.3050701@grosbein.net> <CAJ-Vmok%2BgKXcpzpxNCBhxX8sYSh%2BQO7OaeojB4MCufO%2BA4zceg@mail.gmail.com> <563500FC.8020201@grosbein.net> <CAJ-Vmo=EpmG6OJxq_v_mqKMF48h_B3K7vKqnnaKAi3x1s-uaWQ@mail.gmail.com> <5635148B.2070307@grosbein.net> <CAJ-VmomzkG8ZB0h1Qc=Oeny2ZOzQg1UirUprM_gmMy64F5ZRYw@mail.gmail.com> <56351AA6.80903@grosbein.net> <CAJ-VmomLen5p7ELejU7QtC5CO2j8hydb_CvdOqQsfaaMAtmdkA@mail.gmail.com> <563523CA.3040207@grosbein.net> <CAJ-Vmonpd8R5C%2BNvhOGFD1okkkit990DV8c4Dm%2BLmpZ2uFfVkA@mail.gmail.com> <56367686.4090801@grosbein.net> <CAJ-VmomtJ9eKfAJYfn4e2S1xWN8-YHo0M0KH-9V=VjNBf6vVVA@mail.gmail.com> <563707A0.3040700@grosbein.net> <CANCZdfrB0hkjmTU-9NzimBv=X_h-=bF0D2azBxg=9B=kmitv7Q@mail.gmail.com> <56370E1D.3040801@grosbein.net> <CAJ-Vmo=0vOAq8db_GeLWmdXr7xJdzUh44ZZJrQ9vVdpvzT9hiQ@mail.gmail.com>

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On 07.11.2015 10:57, Adrian Chadd wrote:
> On 1 November 2015 at 23:17, Eugene Grosbein <eugen@grosbein.net> wrote:
>> On 02.11.2015 14:04, Warner Losh wrote:
>>
>>>     Next, USB flash support is not very stable as I have written before,
>>>     lots of USB i/o can easily panic the kernel.
>>>
>>> Does your flash device support trim / delete?
>>
>> Not sure. How do I know? It is just USB pen flash.
> 
> hiya,
> 
> ok, this is next . What's the deal with this? can you panic it and
> report it please? :)

I did earlier in my letter with subject "jemalloc aborts: lloc_arena.c:363: Failed assertion: "p[i] == 0":

> Trap cause = 2 (TLB miss (load or instr. fetch) - kernel mode)
> panic: trap
> Uptime: 3m7s
> panic: bufwrite: buffer is not busy???
> Uptime: 3m7s

However, I cannot reproduce the problem anymore using recent HEAD
compiled without -Os and with kernel having "options USB_HOST_ALIGN=64"
as Warner Losh suggested.






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